Hawkins electrical guide. Questions, answers & illustrations; a progressive course of study for engineers, electricians, students and those desiring to acquire a working knowledge of electricity and its applications; a practical treatise (1914)
Hawkins, N. (Nehemiah), 1833- · New York, T. Audel · leaf 256
Pigs. 751 to 753.—Monitor control switches. Fig. 751, push button start and stopswitch; fig. 752. safety lever control switch with slow and fast buttons for rotary-printing presses. This device will upon pressure of the start button, set the machinein motion and bring it up to the predetermined…
Electrical engineering
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